360
Q:

A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?

A) 54 % B) 64 %
C) 74 % D) 84 %

Answer:   B) 64 %



Explanation:

Let the number be x.

Then, ideally he should have multiplied by  x by 5/3. Hence Correct result was x * (5/3)= 5x/3. 

 

By mistake he multiplied x by 3/5 . Hence the result with error  = 3x/5 

Then, error = (5x/3 - 3x/5) = 16x/15 

Error %  = (error/True vaue) * 100 = [(16/15) * x/(5/3) * x] * 100 = 64 %

Q:

If two successive discounts of 20% and 30% are given, then what is the net discount (in %)?

A) 40 B) 44
C) 56 D) 60
 
Answer & Explanation Answer: B) 44

Explanation:
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0 48
Q:

A, B and C are three students. A got 18% more marks than B and 12% less than C. If B got 220 marks, then how much marks C has got?

A) 295 B) 230
C) 224 D) 245
 
Answer & Explanation Answer: A) 295

Explanation:
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0 34
Q:

If A has got 20% more marks than B, then by what percent marks of B are less than the marks of A?

A) 16.66 B) 20
C) 33.33 D) 14.28
 
Answer & Explanation Answer: A) 16.66

Explanation:
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1 65
Q:

By selling 175 pineapples, the gain is equal to the selling price of 50 pineapples. What is the gain percentage?

A) 28 B) 30
C) 32 D) 40
 
Answer & Explanation Answer: D) 40

Explanation:
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0 48
Q:

The marked price of a sofa set is Rs 4800 which is sold at Rs 3672 at two successive discounts. If the first discount is 10%, then what will be the second discount (in %)?

A) 13 B) 15
C) 14 D) 17
 
Answer & Explanation Answer: B) 15

Explanation:
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0 29
Q:

If the simple interest on Rs. 400 for 10 years is Rs. 280, then rate of interest per annum is

A) 7% B) 712%
C) 714% D)
 
Answer & Explanation Answer: A) 7%

Explanation:
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0 13
Q:

A shopkeeper marks his goods 40% above the cost price and allows a discount of 25% on it. His gain % is

A) 5% B) 10%
C) 15% D) 20%
 
Answer & Explanation Answer: A) 5%

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1 43
Q:

A person scores 45% of the total marks in the exam and still fails by 40 marks. The passing percentage of the exam is 55%. What is the maximum marks of the exam?

A) 300 B) 400
C) 350 D) 550
 
Answer & Explanation Answer: B) 400

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0 55